Is there truth to the fact that you will have a hard time detecting gold (rings/ jewelery) if your discrimination is set above foil? My current retrieval method is to set the disc to foil and when I get a signal, I raise the disc to tab and if the signal disappears or gets crackly, I don't dig. Probably a tab. If the signal is still there after the disc is raised, I dig. I mostly retrieve coins with this method. Should I leave the disc at foil and dig every signal in the hopes of finding some gold? Does anyone have any other good settings/ methods of increasing my chances to find gold? Thank you.